Trouble Shooting - Mitsubishi Electric CITY MULTI PKFY-NBMU-E2 Manuel D'utilisation

10. Care and Cleaning
PMFY-P·NBMU-E
1 Pressing the PUSH button on the outer side of the intake grille causes
the intake grille to open.
2 A filter with an intake grille on it can be removed by pulling the filter
forward.

11. Trouble Shooting

Having trouble?
Air conditioner does not heat or cool well.
When heating operation starts, warm air does not blow from the indoor
unit soon.
During heating mode, the air conditioner stops before the set room
temperature is reached.
Airflow direction changes during operation or airflow direction cannot
be set.
When the airflow direction is changed, the vanes always move up and
down past the set position before finally stopping at the position.
A flowing water sound or occasional hissing sound is heard.
A cracking or creaking sound is heard.
The room has an unpleasant odor.
A white mist or vapor is emitted from the indoor unit.
Here is the solution. (Unit is operating normally.)
Clean the filter. (Airflow is reduced when the filter is dirty or clogged.)
Check the temperature adjustment and adjust the set temperature.
Make sure that there is plenty of space around the outdoor unit. Is the
indoor unit air intake or outlet blocked?
Has a door or window been left open?
Warm air does not blow until the indoor unit has sufficiently warmed up.
When the outdoor temperature is low and the humidity is high, frost
may form on the outdoor unit. If this occurs, the outdoor unit performs
a defrosting operation. Normal operation should begin after approxi-
mately10 minutes.
During cooling mode, the vanes automatically move to the horizontal
(down) position after 1 hour when the down (horizontal) airflow direction
is selected. This is to prevent water from forming and dripping from the
vanes.
During heating mode, the vanes automatically move to the horizontal
airflow direction when the airflow temperature is low or during defrost-
ing mode.
When the airflow direction is changed, the vanes move to the set posi-
tion after detecting the base position.
These sounds can be heard when refrigerant is flowing in the air condi-
tioner or when the refrigerant flow is changing.
These sounds can be heard when parts rub against each due to expan-
sion and contraction from temperature changes.
The indoor unit draws in air that contains gases produced from the
walls, carpeting, and furniture as well as odors trapped in clothing, and
then blows this air back into the room.
If the indoor temperature and the humidity are high, this condition may
occur when operation starts.
During defrosting mode, cool airflow may blow down and appear like a
mist.
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